Are you sure, John? I didn't think any gas chassis had a 50 degree wheel cut back in 1996. Fords F53's were 42 degrees in at least some models. Only reference could find is an ad bragging that it was increased to 50 degrees in the 2008 model.
http://ophelia.sdsu.edu:8080/ford/04-10-2008/about-ford/news-announcements/featured-stories/featured-stories-detail/f53-motorhome-chassis.html
However, a chassis with 16" or 19.5" wheels often had a better cut than the 22.5's